Composition for detonators.



NiTED TATES ,GEORG'E PERCY BICKFORD-SMITH, OF HELSTONE, ENGLAND.

' COM POSITION FOR DETONATORS.

SPECIFICATION forming part of Letterslatent No. 634,716, dated October10, 1899; Application filed Deceznber15',1898. Serial No. 699,329, (nospecimens.)

In (all whom, it may concern/.- Be it known that I, GEORGE PERCY BIOK-FORD-SMITH{n1anufacturer, a citizen of Eng land, residing at Trevarno,Helstone, county of Cornwall, England, have invented a certain new anduseful Improved Composition for Electrically Firing Detonators, (forwhich I applied for a patent in Great Britain,,dated October 5, 1898,No. 20,989,) of which the following is a specification.

My invention relatesto a composition coni antimony sulphide, ninety-sixparts; silver precipitated, one hundred and-eight parts; potassiumchlorate, one hundred and ninetytwo parts; electrotype plumbago, twentyparts. This composition being placed in any suitable casing in contactwith the" exposed ends of a pair of wires can be fired by an electricspark between the wires, causing explosion of fuhninate or otherdetonating charge contained in the casing.

Having thus particularly described and ascertained the nature of thisinvention and the best means I know of carrying the same into practicaleffect, I claim--.

p The composition of matter for detonatcrs, consisting of sodiumtungstate, precipitated c0pper,strontium nitrate, antimony sulphide,precipitated silver, potassium chlorate and electrotype plumbago;substantially as described. i

In testimony whereof I have hereunto set my hand-in presence of twosubscribing witnesses.

G. PERCY BlCKFORD-SMITH.

Witnesses:

JOHN CHARLES MILLs,

JAMES OHvEv.

